Topcon Compu-Vision CV-5000 User Manual

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5. OPERATION FOR TESTS
2 Check if the patient has heterophoria.
When the patient sees the test chart through the red and green lenses, only the cross is
seen with the right eye and only the ring, with the left eye.
If the patient does not have heterophoria, the cross center overlaps the ring center in his/
her vision.
If the patient has horizontal phoria, the centers of cross and ring are disassociated in the
horizontal direction in his/her vision.
If the patient has vertical phoria, the centers of cross and ring are disassociated in the
vertical direction in his/her vision.
3 Measure the horizontal phoria value.
If the patient has horizontal phoria, measure its value.
If the mouse operation mode is not set to "Horizontal prism", click the [H/V] button on the
control window to change the mode.
Ask the patient which direction the cross is in relation to the ring, right or left.
When the cross is disassociated to the left against the ring, click the left mouse button
for the mouse navigation until the vertical center lines of cross and ring overlap each
other.
When the cross is disassociated to the right against the ring, click the right mouse button
for the mouse navigation until the vertical center lines of cross and ring overlap each
other.
4 Measure the vertical phoria value.
If the patient has vertical phoria, measure its degree.
Click the [H/V] button on the control window to change the mouse operation mode to
"Vertical prism".
Ask the patient which direction the cross is disassociated in relation to the ring, upward
or downward.
When the cross is disassociated downward in relation to the ring, click the left mouse
button for the mouse navigation until the horizontal center lines of cross and ring overlap
each other.
When the horizontal line is disassociated upward in relation to the ring, click the right
mouse button for the mouse navigation until the horizontal center lines of cross and ring
overlap each other.
5.2.3 PHORIA TEST (MADDOX)
Measure heterophoria of the patient by using the fixation target and Maddox rod.
1 Prepare for the test.
The measurement of this test cannot be conducted correctly in a bright room. Perform
this test in a semi-dark room.
When you use the TOPCON visual acuity charts, ACP-8 and MC-3, the fixation target is
displayed. The fixation target may noy provide the luminance required for the test as the
dot light source depending on the lighting of the test room. In this case, utilize a suffi-
cient light source such as a penlight.

Topcon Compu-Vision CV-5000 Specifications

General

Brand	Topcon
Model	Compu-Vision CV-5000
Category	Medical Equipment
Language	English